[functional][y] Allow setting test data in test suite
Enhancement to existing tests
Sometime we have same schedule, but different test data. Even though it's possible to move test data to separate file, we cannot reuse same schedule.
- There is a variable which overrides yaml test data
- Documentation is updated accordingly
- We should warn the user in case test data is overridden (in case defined in multiple places)
- We might forbid to import test data in case schedule is defined in the yaml
- Test variable can be used here